ASTM A897M-90(1997)

Standard Specification for Austempered Ductile Iron Castings [Metric] (Withdrawn 2001)

SCOPE
1.1 This specification covers ductile iron castings that are subsequently heat treated by an austempering process as defined in 8.1.
1.2 The application of the austempering heat treatment extends the range of properties achievable in ductile iron castings.
1.3 No precise quantitative relationship can be stated between the properties of the iron in various locations of the same casting or between the properties of castings and those of a test specimen cast from the same iron (see Appendix X1). However, austempering heat treatment will tend to diminish any differences in mechanical properties.
1.4 The production of castings, machining (if required), and the austempering heat treatments may be performed by different manufacturers, as covered in Section 13. The purchaser should establish by contract agreement, at the time of ordering, the responsibility of the various parties for meeting the specification requirements.
1.5 The values in this specification are stated in SI units.  Note 1-A companion specification, A897, has been developed in which the values are stated in inch-pound units. Each specification is independent and the mathematical conversions are not exact equivalents.

General Information

• Status: Withdrawn
• Publication Date: 09-Apr-1997
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.02 - Malleable and Ductile Iron Castings

Relations

• Replaced By: ASTM A897/A897M-22 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 10-Apr-1997

Standards Content (Sample)

NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or
discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.
Designation: A 897M – 90 (Reapproved 1997)
METRIC
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
1
Austempered Ductile Iron Castings [Metric]
This standard is issued under the fixed designation A 897M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Military Standard:
5
MIL-STD-129 Marking for Shipment and Storage
1.1 This specification covers ductile iron castings that are
subsequently heat treated by an austempering process as
3. Ordering Information
defined in 8.1.
3.1 Orders for material to this specification shall include the
1.2 The application of the austempering heat treatment
following information:
extends the range of properties achievable in ductile iron
3.1.1 ASTM designation, with year of issue,
castings.
3.1.2 Grade of austempered ductile iron required (see Table
1.3 No precise quantitative relationship can be stated be-
1 and Sections 5 and 6),
tween the properties of the iron in various locations of the same
3.1.3 Chemical composition requirements, if any (see Sec-
casting or between the properties of castings and those of a test
tion 4),
specimen cast from the same iron (see Appendix X1). How-
3.1.4 Heat treated microstructure restrictions (see Section
ever, austempering heat treatment will tend to diminish any
8),
differences in mechanical properties.
3.1.5 Test coupon criteria (see Section 10),
1.4 The production of castings, machining (if required), and
3.1.6 Lot size and tests per lot (see 10.6 and Section 13),
the austempering heat treatments may be performed by differ-
3.1.7 Special requirements, if desired, including hardness,
ent manufacturers, as covered in Section 13. The purchaser
radiographic soundness, magnetic particle inspection, pressure
should establish by contract agreement, at the time of ordering,
tightness, dimensions, or surface finish (see Section 7),
the responsibility of the various parties for meeting the
3.1.8 Certification, if required (see Section 14),
specification requirements.
3.1.9 Special preparation for delivery, if required (see Sec-
1.5 The values in this specification are stated in SI units.
tion 15).
NOTE 1—A companion specification, A 897, has been developed in
4. Chemical Composition
which the values are stated in inch-pound units. Each specification is
independent and the mathematical conversions are not exact equivalents.
4.1 Although this specification has no specific chemical
requirements, such requirements may be agreed upon between
2. Referenced Documents
the manufacturer and the purchaser.
2.1 ASTM Standards:
5. Mechanical Properties
A 370 Test Methods and Definitions for Mechanical Testing
2
of Steel Products
5.1 Tensile property requirements include tensile strength,
A 732M Specification for Castings, Investment, Carbon and
yield strength, and elongation and apply only after austemper-
Low Alloy Steel for General Application, and Cobalt Alloy
ing heat treatment.
3
for High Strength at Elevated Temperatures (Metric)
5.2 The iron represented by the test specimens shall con-
A 834 Specification for Common Requirements for Iron
form to the requirements as presented in Table 1.
3
Castings for General Industrial Use
5.3 The yield strength shall be determined by the 0.2 %
E 8M Test Methods for Tension Testing of Metallic Mate-
offset method (see Test Methods E 8M).
4
rials (Metric)
6. Impact Requirements
E 23 Test Methods for Notched Bar Impact Testing of
4
Metallic Materials 6.1 The iron represented by the test specimens shall con-
form to the impact properties presented in Table 1.
6.2 Impact energy requirements apply only after test mate-
1
This specification is under the jurisdiction of ASTM Committee A-4 on Iron
rial has been austempered. The impact test specimens must be
Castings and is the direct responsibility of Subcommittee A04.02 on Malleable and
finish ground to required dimensions after heat treatment.
Ductile Iron Castings.
Current edition approved March 30, 1990. Published July 1990.
2
Annual Book of ASTM Standards, Vol 01.03.
3 5
Annual Book of ASTM Standards, Vol 01.02. Available from Standardization Documents, Order Desk, Building 4, Section D,
4
Annual Book of ASTM Standards, Vol 03.01. 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
1

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A 897M
TABLE 1 Mechanical Property Requirements of Grades
Grade Grade Grade Grade Grade
850/550/10 1050/700/7 1200/850/4 1400/1100/1 1600/1300/−
Tensile strength, min, MPa 850 1050 1200
...